1月4日德国马普所汤沛哲博士学术报告

发布者:钟芳发布时间:2018-01-02

      德国马普所的汤沛哲博士今日访问我校,并于1月4日上午10:00在科学楼902会议室做关于狄拉克半金属和新型费米子的学术报告,并介绍他在斯坦福大学张首晟课题组所做的关于机器学习寻找新材料的研究工作。欢迎各位老师和课题组同学参加。

报告题目: 

Antiferromagnetic Dirac Semimetals and New fermions beyond Dirac and Weyl models   

报告人: 

Dr. Peizhe Tang   

Max Planck Institute for structure and Dynamics of Matter   

报告时间14  10:00 am  

报告地点:科学楼902会议室   

摘要   

Analogues of the elementary particles have been extensively searched for in the condensed-matter systems for both scientific interest and technological applications. For example, the Weyl fermions and Dirac fermions have been predicted and observed in real material candidates. In this talk, I will expand the notion of the Dirac fermions into the antiferromagnetic (AFM) system and propose the real material candidates. Our results provide a possible platform to study the interplay between the Dirac fermion physics and magnetism. Then, I will show that new fermions beyond the Dirac and Weyl models, such as such as spin-1 excitations with 3-fold degeneracy and spin-3/2 Rarita-Schwinger-Weyl fermions could coexist with type-I and type-II Weyl fermions in a family of transition metal silicides, including CoSi, RhSi, RhGe and CoGe, when the spin-orbit coupling (SOC) is considered. This work not only identifies a series of desired robust topological semimetal candidates but also provides an ideal platform to explore exotic physical phenomena and future device applications. Furthermore, (If I still have time) I will introduce our recent works about the machine-learning algorithm (Atom2Vec) for the material discovery.